Where to Find the Colors Your Screen Can't Show You

Post by wlonkly » Sat, Jun 20, 2026, 11:51 PM UTC

fmajid wrote: post #111

NooneAtAll3 wrote: post #74

Earlier quoted context omitted.

what's the alternative metric to look for as a consumer?

Few bulb manufacturers even bother to report CRI, unless it is decent (CRI > 90). If CRI is not reported, you can be sure it's bad, 80 or less. Unfortunately, there isn't really a way for a consumer to know short of buying a spectrometer like my Sekonic C-800 Spectromaster. For illustration, I have uploaded a few readings here, mostly flashlights, not LED bulbs: https://majid.info/images/reddit/spectro/ If you look a…

Post by [deleted] » Sun, Jun 21, 2026, 1:15 AM UTC

drumdude wrote: post #107

js2 wrote: post #84

Earlier quoted context omitted.

> The full Rec. 2020 color space can be reproduced only with laser projectors, because it uses monochromatic primary colors. All of the non-commercial triple laser projectors I'm aware of are single-chip DLP, so they suffer rainbow artifacts and have poor black levels. They're also liable to laser speckle[^1] if you're not careful on your screen selection. The JVC (LCoS), Sony (LcoS) and Epson (LCD) laser projectors…

Cinema RGB laser projectors are around $50,000. The cheaper non cinema versions are probably around $20,000.

Post by red75prime » Sun, Jun 21, 2026, 4:13 AM UTC

adrian_b wrote: post #49

red75prime wrote: post #37

Earlier quoted context omitted.

> the relation between those areas would be opposite in a uniform color space. If I understand correctly fig. 3 in [1] should be perceptually uniform. The bluegreens missing from sRGB, but present in BT.2020 comprise a sizeable chunk comparable to redyellows. [1] https://www.researchgate.net/publication/345252499_Evaluatin...

Indeed, "Figure 3" from that article should be a realistic depiction of the differences between sRGB, Display P3 and BT.2020. It is true that both the red and green primary colors of sRGB are bad (because they correspond with obsolete CRT phosphors that have not been used for decades), but in practice the defects of the green primary color are much less important, because the objects with saturated green colors are m…

Post by fmajid » Sun, Jun 21, 2026, 9:35 PM UTC

wlonkly wrote: post #121

fmajid wrote: post #111

Earlier quoted context omitted.

Few bulb manufacturers even bother to report CRI, unless it is decent (CRI > 90). If CRI is not reported, you can be sure it's bad, 80 or less. Unfortunately, there isn't really a way for a consumer to know short of buying a spectrometer like my Sekonic C-800 Spectromaster. For illustration, I have uploaded a few readings here, mostly flashlights, not LED bulbs: https://majid.info/images/reddit/spectro/ If you look a…

"C-800 Spectromaster" is exactly how specialized devices like that should be named.

Post by krackers » Mon, Jun 22, 2026, 12:45 AM UTC

isoprophlex wrote: post #26

frotaur wrote: post #17

Its unclear to me why the color space is 2-dimensional. Why wouldn't it be a 3-dimensional space, indexed by how much each of the 3-cones is activated ? Not clear to me from the article!

There are three cones, but there is an additional constraint that we plot the colors at maximum summed luminosity. So for one cone you would just have a point; two would show a line from 0% cone A+100% cone B -> 100% cone A; three is a plane